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Thomas Anderson (1819-1874)

Born in Scotland.
He discovered pyridine.
He isolated and investigated pyrrole.
Svante Arrhenius (1859-1927)

Born in Sweden.
He researched electrolytic dissociation.
He developed the Arrhenius equation.
He was awarded the Nobel Prize in chemistry in 1903.
Francis William Ashton (1877-1945)

Born in England.
He performed pioneer work on isotopes and their separation by mass spectograph.
He was awarded the Nobel Prize in chemistry in 1922.
Lorenzo Romano Amadeo Carlo Avogadro (1776-1856)

Born in Italy.
He proposed the principle that equal volumes of gases at the same temperature and pressure contain the same number of atoms.
He formulated Avogadro's Law.